Piquerez



1956 E. PIQUEREZ 2,736,165

CRYSTAL FOR A TIMEPIECE Filed March El, 1955 United States PatentCRYSTAL FBR A TIMEPIECE Ervin Piquerez, Basseconrt, SwitzerlandApplication March 21, 1955, Serial No. 495,396 Claims priority,application Switzerland April 20, 1954. 6 Claims. (Cl. 5891) Myinvention has for its object a crystal for a timepiece and moreparticularly it has for its object a cap of unbreakable glass and acarrier extending underneath the latter and constituted by a ringmatching the inner outline of the cap and by arms starting from saidring and extending towards the center of the cap so as to carry it.

I have illustrated, by way of example, in accompanying drawings apreferred embodiment of the object of my invention together with twomodifications thereof; in said drawings:

Fig. 1 is a partial axial sectional view of a first embodiment.

Fig. 2 is a plan view on a smaller scale of the cap carrier.

Figs. 3 and 4 disclose each a modification.

The embodiment illustrated in Figs. 1 and 2 includes a cap ofunbreakable transparent material the central portion of which isdesignated by 1a and the peripheral depending section by 1b. Inside saidcap is housed a rigid support or carrier shown separate in Fig. 2. Itincludes a ring 2 matching both the shape of the peripheral section 1bof the cap and that of the periphery of the central section 1a andfurthermore four radial arms 2a extending towards the center of the capwhere they meet and form the small disc 2b. An annulus 3 engages with atight fit the inside of the ring 2. It acts, through the agency of thelatter, on the peripheral depending section 1b of the cap so as to urgeit against the rim inside which the crystal is fitted.

The modification illustrated in Fig. 3 distinguishes from thearrangement which has just been disclosed through the fact that thecarrier 4 the shape of which is the same as that of the carrier shown inFigs. 1 and 2, is fitted within the thickness of the cap 5 and is flushwith the inner surface of the latter. In the modification shown in Fig.4, the carrier is similar to the preceding carrier with the differencethat the four arms are interconnected together underneath the centralsection of the cap by means of an annular member 2c replacing the disc2b of Fig. 2.

The annulus 3 may be omitted and it is also possible to give the ring 2a sufiicient thickness for it to play also the part of said annulus.Lastly the carrier may be provided with one or more time scales of thetype usually provided on the dial of a time-piece.

What I claim is:

l. A crystal adapted to be fitted in the rim of a timepiece, comprisinga cap fitted in the rim and made of unbreakable transparent material anda carrier extending underneath the said cap and including a ringmatching the inner periphery of the cap and arms starting from said ringand meeting one another to form with the ring and with each other anopen-work carrier structure for the cap.

2. A crystal adapted to be fitted in the rim of a timepiece, comprisinga cap fitted in the rim and made of unbreakable transparent material anda carrier extending underneath the said cap and including a ringmatching the inner periphery of the cap, a central member extendingunderneath the central section of the cap and a plurality of radial armsrigidly interconnecting said central member with the ring.

3. A crystal adapted to be fitted in the rim of a timepiece, comprisinga cap fitted in the rim and made of unbreakable transparent material, acarrier extending underneath the said cap and including a ring matchingthe inner periphery of the cap and arms starting from said ring andmeeting one another to form with the ring and with each other anopen-work carrier structure for the cap, and an independent annulusfitted inside the carrier ring and urging the crystal against the rim.

4. A crystal adapted to be fitted in the rim of a timepiece, comprisinga cap fitted in the rim and made of unbreakable transparent material anda carrier extending underneath the said cap and including a ringmatching the inner periphery of the cap, the thickness of said ringbeing sufficient to urge the outer periphery of the crystal against therim, and arms starting from said ring and meeting one another to formwith the ring and with each other an open-work carrier structure for thecap.

5. A crystal adapted to be fitted in the rim of a timepiece, comprisinga cap fitted in the rim and made of un breakable transparent material,said cap including a main central slightly convex section and adepending peripheral section, and a carrier extending underneath thesaid cap and including a ring, the outer surfaces of said ring matchingthe inner surfaces of the depending peripheral section of the cap and ofthe peripheral portion of its main section, and arms starting from saidring and meeting one another to form with the ring and with each otheran open-Work carrier structure for the cap.

6. A crystal adapted to be fitted in the rim of a timepiece, comprisinga cap fitted in the rim and made of unbreakable transparent material anda carrier fitted inside the inner surface of the cap and the innersurface of which is flush with the inner surface of the cap, saidcarrier including a ring matching the inner periphery of the cap andarms starting from said ring and meeting one another to form with thering and with each other an open-work carrier structure for the cap.

No references cited

